Github user srowen commented on a diff in the pull request:

    https://github.com/apache/spark/pull/17683#discussion_r112631811
  
    --- Diff: 
core/src/main/scala/org/apache/spark/storage/BlockManagerMasterEndpoint.scala 
---
    @@ -497,11 +497,18 @@ private[spark] class BlockManagerInfo(
     
         updateLastSeenMs()
     
    +    var blockExists = false
    --- End diff --
    
    Although you could just assign `val blockExists = 
_blocks.containsKey(blockId)` once and reuse it instead of a `var`, it's minor. 
This looks good.


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